In my M5030SU Kubota I use Rotella T 10W-30 for the last 10yrs. Kubota has 10W-30 oil we used to start with until I found the Rotella T10W-30 at Walmart. I run it yr round in the tractor.
In my 97 Dodge with 5.9 Cummins the only thing since the truck was new I have used Rotella T 15W-40. It still gets the same mileage now as it did new 18 to 20mpg highway and 14 to 17 mpg pulling gooseneck. 288,000 mi on the truck now. No break downs with the engine. Replaced starter alternator, batterys and radiator, but the engine itself is still running strong. And it does have some oil leaks.
The only thing my truck keeps getting lighter. Loosing sheet metal due to rust. LOL
In my 97 Dodge with 5.9 Cummins the only thing since the truck was new I have used Rotella T 15W-40. It still gets the same mileage now as it did new 18 to 20mpg highway and 14 to 17 mpg pulling gooseneck. 288,000 mi on the truck now. No break downs with the engine. Replaced starter alternator, batterys and radiator, but the engine itself is still running strong. And it does have some oil leaks.
The only thing my truck keeps getting lighter. Loosing sheet metal due to rust. LOL